Red Dye Allergy

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So my son has been sick for like two weeks or so. Started out with throwing up, moved to a fever and rash then he got a runny/stuffy nose. He was put on antibotics and we started to get better but the rash and runny/stuffy nose never cleared up. So we took him back to the doctor and he seems to think it's an allergic reaction to something, possibly red dye. I guess I am dumb because I had never heard of this before. And now, I am freaking out! My husband was the one that took our son to the doctor yesterday so I wasn't there to ask questions, but I thought it was literally like red dye - like shirts and clothes and such - not food! Anyone familiar with this???? We aren't 100% sure he has this allergy but we want to try to see if that is infact it but trying to elminate one thing at a time. Advice?? Suggestions?? Our son is 2 and a half.